A small muscular artery in the heart, specifically, in the moderator
band. Notice the three layers of the vessel: intima, media, adventitia.
The connective tissue in the adventitia stains blue. It is obvious that
the smooth muscles of the media make up the thickest portion of the
vessel wall. Original mag. 50x Masson trichrome. Samll artery. Heart.
Circulatory System. Sheep.